Contra dances vary a lot in terms of who volunteers, who gets paid, how much is paid, and in other expenses. There was recently a discussion about this on the shared weight list and I thought I would post a summary.

place	frequency	admission	attendance	hall	caller	band	sound	extra
St Louis Sunday Night	weekly	$5	60-80	$125	$45 + $15 beginner session	$200 total	$25, equipment provided, free admission elsewhen
St Louis Saturday Night	monthly	$7	50-80	$125	$60 + $15 beginner session	$250 total	$25, equipment provided, free admission elsewhen
St Louis Callers Choice	monthly	$7	50-80	$125	unpaid, open calling	$50/person	$25, equipment provided, free admission elsewhen
St Louis English Workshop	monthly	$5	?	$125	unpaid, open calling	unpaid, recorded music	$25, equipment provided, free admission elsewhen
St Louis English Dance	monthly	$8	?	$125	sometimes paid, sometimes not	$50/person	$25, equipment provided, free admission elsewhen
St Louis Waltz Party	monthly	$10	40	$125	$25 for workshop leading	$50/person	$25, equipment provided, free admission elsewhen
St Louis English Ball	quarterly	$10	30-40	$125	$30	$50/person	$25, equipment provided, free admission elsewhen
St Louis NYE Contra Ball	yearly	$10	90	$125	unpaid, open calling	$300	$25, equipment provided, free admission elsewhen
Portland Oregon Contra	twice monthly	$9	80-150	$300	$70	$70/person, up to four people	$125	profit sharing
Portland Oregon Fifth Saturday Contra	every few months	$9	?	?	open calling, $70 lead caller only	open band, $70 two lead musicians only	$125	profit sharing
Concord Massachusetts Thursday	weekly	$8	100-200	~$300	depends on total number of performers: 3=$155; 4=$145; 5=$125; 6=$104; 7=$89	depends on total number of performers: 3=$155; 4=$145; 5=$125; 6=$104; 7=$89	$50, equipment not provided	profit sharing
Farmington Maine	monthly	$6	20-30	$100, paid for by a generous dancer	one share	one share each, up to five	one share
Glen Echo Maryland Friday	weekly	$9	275	40%, $700 guarantee ($350 midMar-Nov)	10%, $100 guarantee	35%, $100 guarantee/musician ($400 max guarantee)	7%, $100 guarantee, max $200
Cambridge Massachusetts BIDA	monthly	$5-$10 sliding scale	80-110	$165	$75	$75/person	$75, equipment not provided	profit sharing
Eugene Oregon	twice monthly	$8	?	$114	$75	$75/person, $300 max	$150	profit sharing (rare)
Corvallis Oregon	twice monthly	$7	?	$80	$50	$50/person, up to $200	$100	profit sharing (common)
Austin Big Dances	twice monthly	$9	60-90	$230, $275	$30	$30/person	$75	profit sharing
Austin Barn Dancers	weekly	$0	35-40	$0	unpaid	unpaid	probably unpaid
Austin Texas English	monthly	$6	25	$62.50	unpaid	recorded music	?
Bay Area Country Dance: Contra	weekly	$10	?	?	$50	$50/person	$25
Bay Area Country Dance: English	weekly	$10	?	?	$20	$20/person	$20, usually unpaid
Cambridge MIT	twice monthly	$6	10-50	$0	~$40	~30/person	unpaid
Medway Massachusetts	monthly	$8	6-20	?	?	$100 total	band brings and runs sound
Woodstock Vermont	monthly	$8 (includes dinner)	80 for family dance, then 15-40 for contra	$130, sponsor paid	organizer calls unpaid, one share if not	one share	band provided
Davis Square Somerville	monthly in the summer	free	50	free; outdoor	multicaller, unpaid	open band, unpaid	acoustic
Asheville: Old Farmer's Ball Thursday	weekly	$6	200+	free, in exchange for $1 student admissions	one share of 70%, $100 guarantee	one share of 70%, $100 guarantee each	$125
Country Dance New York	weekly	$15	?	?	$110	$90/each	?	profit sharing
Amherst MA	near-weekly	$10, fulltime students $8, high school students $6	median 75; range 50-165?	$175	$75	$75/each	$23-$30, equipment provided	profit sharing: Series takes 20% of profit after paying all expenses and guarantee to performers. The rest (80%) is split between performers.

Update 2011-07-11: added woodstock vt, admission, attendance, hall cost, links. Admission doesn't list discounts for named categories (members, students, etc)
Update 2011-07-12: added asheville nc Update 2011-07-17: added cdny, updated glen echo friday Update 2013-06-15: added amherst