Uchiha and Senju where the main clans being hired that's a fact tho Obito and Hashirama said it.They were not the only clans being hired for war. We have no way of figuring out how much they made off commission and how much wealth was obtained. The countries and borders were different and the economic climate was as well.
You're speculating that just because they were one of the strongest that they were paid much more, that they actually saved that money (and it wasn't used for warring) or that they were even paid in currency. It could have been provisions, land etc. We simply do not know to that extent for you to assume a clan without a village had more wealth than an established village at any given time.
The only benchmarks we have on clan wealth was Konoha and Uzushiogakure. In which case, yes. The Uzumaki were wealthier than the uchiha.
owning 3 mountains isn't more valuable than owning a village. Not to mention the Uzumaki also had their hideouts as well.
Like i said tho. At that time and age no clan or anyone for that matter had a village not the Uzumaki not the Sarutobi not the Shimura no one. Just because the Uzumaki made one after Uchiha and Senju already joined forces and made a village mean they were richer.
Who said it was?
They really didn't tho. The only known "hideout" they had was on the outskirts of Konoha where those masks was held. While Uchiha have hideouts in mountains and underground.