At the September 22, 2008 Takoma Park city council meeting, the City of Takoma Park voted to authorize a speed camera contract - without discussion - under the same per-ticket payment terms as Montgomery County.
The resolution appears to include a slightly modification to the Montgomery County contract payment terms with ACS State and Local Solutions (the greater of $3000 per van or $16.25 per citation) stating that:
"If the total of the City’s paid citation revenues are less than $2,999.00 per month per mobile unit for two consecutive months or for any two months in a six-month period during the term of the agreement or any renewals, the contract provides for a renegotiation of the per citation rate and/or the monthly minimum compensation payable to the contractor. If the City, in its sole discretion, is not satisfied with the results of such renegotiation or with the revenues derived from the photo speed enforcement program or the City determines that photo speed enforcement is no longer an appropriate enforcement mechanism for the City, then the City may terminate this Agreement for convenience pursuant to paragraph 11."
This appears to have the effect of establishing a minimum ticket quota for the contractor to ensure that the city does not lose money. Given how profitable the cameras have been in other areas like Chevy Chase, its unlikely they'd ever fall below the $2999 per camera van quota, but it sort of ironic that they might penalize the contractor if the cameras miraculously stopped all speeding in the city.
Ticket quotas by law enforcement officers, both formal and informal, are banned by Maryland Statute §3–504.

A class action lawsuit has been filed over the matter of the per-ticket payments. In late August a Montgomery County court gave the plaintiffs in that case 45 days to re-file their complaint with Montgomery County (who holds the contract) rather than the cities of Rockville and Chevy Chase as the defendant. The new filing was made on October 6 and the case against Montgomery County is now advancing.