Unfortunately you have no prior reputation here and the sale of reversible payment methods (eg Google wallet) requires significant reputation. The reason for this is that so many scammers have had these kinds of payments reversed in the past, sometimes long after a deal was (apparently) successful. This has effectively ruined the ability to use these payment methods for pretty much everyone.
Even if you are not a scammer, your potential trading partners are going to think you are.
PayPal is just as bad, if not worse. Yet sellers don't seem to mind it as much here yet GW = automatic scammer.
Edit: there was also skepticism with PPMC, which I know for a fact isn't reversible.