So what makes you think that a company that would rip you off for cash wouldn't rip you off with your mastercard/visa?
Are you gonna complain to the authorities that you didn't recieve your very illegal seeds?
If you are gonna buy seeds, do it from a reputable dealer.
Go to a site you trust (like rollitup.org) and find out which sites are good and which are bad for buy/getting seeds. Then roll the dice. It doesn't matter if it is paypal, credit card, cash, or money order... If a site wants to rip you off, they can. But then what happens when tons of people start complaining on various message boards that a certain site is a rip-off? I will tell you what happens, that place's orders dries up. So it makes sense for the places to keep thier customers happy if possible.
So in the end,
I believe it is always best to send cash. Just my opinion.
Celticman
PS If the house you live in isn't yours and you are having illegal shit sent there, shame on you!