Hiya there, I just had the same problem. Funny thing is, I bought several VSTis over Share-it with my same e-mail-address before.
Additionally I have to say the customer support of share-it is unrivalled in unfriendlyness. I wanted to sell my z3ta+ license a year ago. Now the developer, why ever, refuses to take part in ANY sellings of his licenses (but does allow it). He stated share-it would handle this. And after 7-8 e-mails it turned out they didn’t…. Quite ridiculous were the last e-mails, kind of “we have other things to do why do you write”.
Well I did what the developer of zeta+ had said 🙄
I would prefer paypal as official purchase option by far. You get more spams this way (“please type your password in and re-authorize” and stuff like this), but well, this is how a part of the internet is, and you can really easy see which mails are faked and which are from paypal 🙂