You will always earn more buying at 1000 and selling a 1500 than buying at 1500 and selling at 2000.
Percentage wise on capital used? Because otherwise it looks the same to me, unless I'm missing something.
100% off-topic, but this is too good. Happened to me today:
Is there something wrong with me?
She wanted to buy some bitcoin from me for backpage (I think).
I was trying real hard here...even not asking a commission.
snip
edit: Like a monty python clip ain't it?

Sorta reminds me of the old riddle...Which weighs more--a pound of lead or a pound of feathers?