It is hard to imagine anyone buying in this day if you do not take paypal or credit cards. The me, if someone says they will not take credit cards what I hear is that they do horrible work and get tons of complaints so they get charge backs. In order to stop this they demand money orders so that no matter how unreputible they are, money gets collected.
This may not be the case with you, but as a consumer, I assume it to be true. I then buy from someone else.
I buy and have sold many thousands of dollars worth of stuff online in hundreds of transactions. I have been ripped off once (ironically from a guy on this site). He convinced me he would not use paypal, I sent him money, never got the tool I bought. I will never again send anyone money directly.