Edit: I would sell at half price.
You should really email directly, but someone asked the same question recently and I'm pretty sure the answer is no, because the license is in your name and cannot be transferred.
Ah ok, thanks for replying.
The answer is no. This was ask apx a month ago. The license a contractual agreement between the purchaser and company. Selling your license on a developer tool means the purchaser has no agreement with Scirra. Thus they have no allowance to use the software. We may think of the license as tangible, but it is in fact an agreement.
Ok, I thought so but was not sure, thanks for the replies.
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How IP works online, de jure
The first-sale doctrine does not apply to purely digital goods. Licences are always non-transferrable unless you know for sure otherwise.
How IP works online, de facto
The only way to own anything digital is to make it yourself or steal it. I don't condone the second route, we've come a long way since the bad old days of the 90s.