I worked for like 6 years for a big adult company in Europe, they was make around 30 mil. a year profit. I was go work for that company just before SMS en phone sex was get less populair and internet dating more populair, the profit was growing every year, the important thing is dont bet on 1 horse but on 10. Start 10 sites, make alot of ads on the internet and work alot! It will pay off.. 3 months ago I was start on my own company, and since the begin i was make 5 digits a month but you have to put alot of work in it. Now I am busy with automating all the processes to safe on people payouts, but always think what the client want and not what you want. But to start now in the dating industry with no experience at all, it is really difficult.
My advice, get some expierince in a company and after start something for yourself.