Don't followers consume ammo? Pew Pew is a giant ammo drain! I don't have the caps, nor do the merchants have the supply to fuel that many energy cells Pew Pew devours. Even the biggest gas guzzlers are more efficient with their gas than Pew Pew is with its energy cells!
Followers do consume ammo when using non-default weapons, yes. And Pew Pew is a horrible ammo eater. BUT:
1) You don't have to insist on Veronica using ranged weapons ALL the time. The girl loves punching, so let her- especially indoors where punching beats shooting anyway.
2) With the sniper playing style, you take most kills anyhow. V doesn't get to do a lot of shooting OR punching. But on the rare occasion that you need her shooting, you REALLY need her shooting, and puny danage from RCW isn't what you want.
3) If you use guns, you can accumulate many thousands of small energy cells frmo scavenging alone, and convert ECPs and MFS-s into even more energy cells. I have never had supply issues in this game except with duct tape.
4) In my experience, "I don't have the caps" doesn't exist in this game from the moment you reach the Silver Rush, Boomers or you acquire Jury Rigging. Most of the time I find myself with upwards of 50 000 caps, tons of valuable gear and no one to sell it to. Which is why I don't usually gamble- it's the slowest way of getting rich.
5) Fiends respawn.