I wanted to buy every workshop in EVERY city and spend the play through as a caravaneer, if I just happened to kill some bandits along the way then bonus.
Yep, you should be able to play the game that way. In fact you can, but at some point it kinda tops out. I hope they raise the limit, even if they balance it out with some kind of management issue (like the more workshops you have, the more discord you have amongst your workers and some kind of rivalry mechanic.)
In Warband I did have a game where I bought a workshop in every city.
The game felt super slow trading my way up, the XP rates are garbage and the perks are kinda pointless in the current situation but when i finally felt like I was making progress I have just hit this stupid wall of not being able to own any more.
The XP rates are much better in the 1.1 beta, you'll enjoy that when it goes to the live branch (or now if you want to switch).
I agree some of the perks are rubbish, but then this seems to be a trend in a lot of games now... 5% bonus to something that doesn't happen very often is a very common kind of perk I see in games now; frankly it's just bad game design and a waste of brain cells even worrying about.
OTOH, my 1 influence per day perk really snowballed into something big for me. Also +3 hitpoints in a game where you aren't supposed to be a tank is reasonable, I think.
But maybe trading your way up is supposed to be slow... it's not easy if you go the recruit and loot way either, and least not if you want to be honorable and not attack villages. I did a mix of trading, looting and errands and managed to get my first 15k quick enough to be challenging and rewarding. It probably took about 5-10 hours to get to 15k, and now I'm 30 hours in and I have about 400k and I'd have half a million if I didn't just go on a spending spree for armor and weapons.
So now i'm going to buy caravans, are there a limit of 3 of those too?
Caravans require a companion to operate and companions are very limited. The returns are greater but you have to invest a companion and there is a risk the caravan will get attacked and then you have to set it up again from scratch. I just lost one of my caravans but not before I made a lot more back it helped me progress.