What's wrong with loaning bitcoins? Loans have been around for as long as there was money. No reason to think the rise of bitcoin would end the demand for loans.
Monetary gain, within the context of “loaning,” is, traditionally, realized via positive interest—which is an artificial scarcity. Artificial scarcity reserves, for itself, resources that, without its imposition, could be allocated to greater machinations.
Obviously if I'm taking a loan, I know I have to pay it back with interest, which means I will have less money later. That means I've made the decision that having the money now is more important than having more money later. Again, why is that bad?
My reply has the following two versions: (a) "Interest constrains the pursuit of ends for the pursuit of means," and (b) "Because, though you are not, you are restrained as if you were." (See my emboldened text above.)
Sorry, I just can't follow whatever point you're trying to get across.
Interest permits one more value than (s)he creates, and, thus, reduces the perceived necessity of its production.
(Note, that "perceived reduction" does not, necessarily, correspond to more extrinsic ones.)