Ha ha - it wasn't intended as an experiment. I just got a little carried away with my messing about!
I think that they've already got a decent model with monetising it. The 50 goes fairly quickly when you mess around like I did and then 15 is just a nice way of keeping people interested. I was tempted to buy more credits.
This method also works well for anybody wanting to build apps based upon their API as presumably, developers will also be buying lots of credits. So they probably don't need an alternative paid version (although the possibility's there).
Actually was wishing their paid version has more functionality .. like higher resolution images .. variations of 2 or more previous generated images ... etc ..
Well then again .. may be a little to greedy to wish for those for now .. given that this space is still in it's infancy :)
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