Single payments for regional advertising of profile (one-time appearance in scrolling banner for $1 – user picture, link, short text for mouseover; bidding war for stationary second banner cost of $1/minute).
Yes/No; While it is free to use, POF offers premium services as part of their upgraded membership, such as seeing the date and time a user viewed your profile and allowing you to see whether a user read and/or deleted your message.
All Paid users can message and post and they also have added benefits.
for named portal; also 3-5% of (#31) and (#191), which offer access to the same services and communication with the entire user pool through ru and love.subdomains Yes: Premium content like additional search criteria and double appearances in others' relevant searches for "VIP membership".
Any site that did not make this list probably has poor membership quality, a difficult interface, or is too expensive, etc.