If you sold ice cream, would you taste it to make sure it’s ok?
Same thing applies here.
If you have an addictive personality, you could get addicted to gambling just as alcohol, nicotine, sugar, jogging, extreme sports, twitter and whatever all people get addicted to.
In that case just stick to the free versions, they are the same and they don’t carry the excitement that gambling does. But you definitely need to know your product.