My first experience with whoring

I want to deposit 100 euro in betfair and to get 70 euro of bonus. So I will receive together 170 euro for the game. After i will play 1 euro per hand, and to do this bonus.
Wagering Requirements for betfair is 30xb, end result should be about 60 euro. Is there anyone, who can tell me it is profitable, on the basis of his own experiences? How is my chance that i get a bonus and the final results will be 60 euro?

you play $1 per hand on what? blackjack?

if you play BJ, then

the wagering requirement is $170 x 30 = $5100
the house edge is 0.4%

Expected loss due to blackjack house edge = $5100 x 0.004 = $20.4
Expected ending balance =  $170 - $20.4 = $149.6
Expected net gain = $149.6 - $100 deposit = $49.6

yes it is a mathematical calculation and you expect to know some basic blackjack rules and follow the Do's and Dont's here

Bonus Clearing Do's and Don'ts
DO:
Choose the game with the lowest house edge and variance available, such as Blackjack, Craps, Baccarat, Texas Hold'em Bonus, or Jacks or Better Video Poker.
Follow the strategy for the game that minimizes the house edge.
Wager small amounts starting at 1% of your bankroll, until you establish your confidence with the game and your risk tolerance. This will minimize the chance of you busting after a bad streak.
Always read the casino's terms and conditions before playing! Among other things, these will often set out which games are acceptable when playing with a bonus.
Have fun and enjoy yourself.
DO NOT:
Never play with money you cannot afford to lose.
Do not raise your bets in an attempt to recover losses. This can be a quick way to bust. You will have bad streaks from time to time, just as you will have winning streaks. Learn to accept this.
Never try a gambling system with your own money. There has never been a single system invented that has been proven to work. Yes, we have all the heard the one about betting on red or black and doubling your bet every time you lose at roulette. You did not invent it. It is called a Martingale system and it does not work.
Never try to cheat or deceive the casino by doing things such as trying to claim multiple bonuses under multiple accounts at the same casino, or trying to play in a higher valued currency other than your own. You can and will get caught. Again, read the terms and conditions before playing.

I really cannot answer that question from you.  All I know is that if you bet big, you might bust out early.  If you bet too small, it'll take forever to clear out wagering requirement.  Just ask yourself how much time you would like to spend on it.  If you have many losing streaks, then you might lose it all, if you have many winning streaks, you'll have big profit from this bonus.

so, get profit from bonus is hard? Is it dependent on happiness?

Sorry, I am trying to understand it

you  could profit from the bonus, you need lots of luck also.  The casino wouldnt want to give you the bonus if they know for sure each and every player will win and players wouldnt want to play with any casinos that they know for sure they have no chance of winning, lol. 

I started whoring by playing on casino sites with cash back bonuses. So even if I lose, I will still get my own money back. This way, I never find myself losing that much.