[ultraman zoffy]

I'd say it's more relevant to think of scalpers in terms of their actions, as opposed to the prices they are charging. Gathering up 15+ Black Widows in an attempt to corner the market is a d*ck move, no matter what you're charging (and you know it won't be retail for all the effort hoarding those figures required).
Everyone on this board has probably sold a figure for at least even a hair above MSRP, and if price is your only measure, than yeah, you just scalped someone. But unless you're systematically hunting out one per case or potentially rare figures and hoarding them with the sole intent of making a profit, you're perfectly entitled to sell a figure at what it's worth to YOU (either due to how much you like that figure or in relation to what you yourself paid for it), just like a buyer is entitled to pay what it's worth to them. That's just the way things work. Someone is charging a price you don't agree with, just pass on it... simple as that.
That swapping sh*t though... that stuff is just baaaad. Worked out in my favor once though when I grabbed an MU FF team set that had a solid Invisible Woman mashed with the clear variant's limbs. Thanks for that cool custom, swapper dude! lol