1. I think that previously you were on the site with Russian mail brides, the site that sells addresses. I admit that it could be rather disappointing.
About 5 percent of women who register at the site delete themselves in 5 or 10 days, getting disappointed in Internet dating services in general, or because it was done on spur of the moment. Sometimes they even manage to find someone at the site very quickly and want to continue communication only with this person. However, in respect of the site that sells emails, suchlike girls would not be deleted from the database. Their emails will get sold again and again, but the girls would never answer.
About 5 percent of women pretend to be so much interested in their search that they check their mail once a month. On the "mail order brides" it is impossible to distinguish them from the girls who are really interested and come to check their mail regurarly.
The most serious problem at the site that sells emails are scammers. If the first letter seems like scammer's we check the girl's address and other things the same day. If we see that a girl is really a scammer, we put her to our scammer-list and men can see her there and be warned about her. It is easy and quick to check. But when men buy the address how can they be up to date if she is a scammer or not?
About 6 percent of women at the site change their personal emails each month, which means that their old ones become invalid, but still they get notification about new mail in their profile's inbox delivered to the new address. But how can it be done at the sites that sell emails?
As you can see, it is really difficult to have updated the girls' database at the site. If you do not check it regularly, men's messages will return unread, the girls will never answer or answer in a month after the man has already forgotten about them.
2. You do not pay for communication. You pay for service, for the system. It is not seen how much work daily has to be done so that the site functions well.
A lot of work is done to check new girls and consider all the complaints. Nobody wants to be on the site where there are more scammers than normal girls.
The same as for getting rid of the female scammers, a lot of work has to be done to check all the men. There is such a thing as Nigerian spam. People from Nigeria register at the site, pay for the membership by fraudulent credit cards and then begin to try to scam the girls (alas, it happens also!)
A lot of work is done to make the site easy to search for Russian girls. It is necessary to have big choice for both men and women.
Several programmers work all the time to bring new features to the site.
Several servers work in different parts of the world to make the sites quick to download for people from all countries.
The work of designers, psychologists, managers, system administrators, support managers should be paid also.
If you think that it is super profitable business when you just sit and get money out of nowhere, then try :) and we'll see.