Actually, I have a plugin that autocorrects bitcoin to buttcoin, simply because I find it impossible to take seriously anyone speaking of bitcoin as being the most amazing thing ever, and that it's the savior of the economy, and I didn't go back and correct it in every spot. You'll notice I did go back and fix it this time.
In the passage you quoted of mine, if you'd go back and read it, I said that there was a "higher percentage of shady folk" involved in Bitcoin. You'll notice I didn't say everyone involved in Bitcoin was a criminal. You mentioned Dell, newegg and Microsoft accept Bitcoin, as does ABU Games, as mentioned in a previous post. You also mentioned that banks are interested in it, too, but you didn't mention that some malware that locks up your computer if you don't pay them accepts Bitcoin as well. You also don't mention the Bitcoin exchanges that have shut down and disappeared with peoples' bitcoins, or that the main currency used on Silk Road was Bitcoin. Here's one writeup on a scam from the New York Times. http://nytimes.com/2015/07/26/business/
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I'm going into this assuming you personally, and most, if not all, of the people you deal with are not scammers or shady folk. Please don't respond as though I accused you of being a thief.
I was using Jesus Crist as a term of exasperation because of all the possible drawbacks of trying to set up a small business to be able to use bitcoins. It seems like too much of a headache to try to set up a marketplace for, considering there's one coder running this site, and he's trying to support himself off of the site, and if you really want to use Bitcoin to buy a magic card, you can go to ABUgames.
I suggested the automatic conversion of bitcoins to cash because it'd be easier to set up a payment system that treated bitcoins as an alternative form of payment, and not have to set up a completely different payment system that deals in Bitcoin exclusively. If it's all on one payment system, then it's a simpler site, with less to go wrong, not to mention, if the site converts one way, Bitcoin to cash, then Sebi would be able to also go the other way, for sellers who prefer to be paid in Bitcoin in lieu of cash.
There's also that the site has its' own selling fees, and the site may not want to end up having to turn them from Bitcoin into actual money that can be spent literally anywhere.
Ultimately, my problem with this site switching to accept Bitcoin is that the site is still really small, with 92k+ of registered users, of which I'd have to assume a very large portion are inactive. The one seller that is most active is adventureson, and they've only made 788 total sales since the marketplace went up. The marketplace is very low traffic, and, as such, the Bitcoin Deckbox marketplace would involve a much smaller subset of users. Implementing Bitcoin transactions seems like it would create way more trouble than it is worth for the Deckbox team.