Hi, I dont know if you have looked ingame yet, but a few years ago MindArk introduced auction graphs which you can access via the auction house, there you can look how much of a certain resource gets traded daily/weekly/etc.
Also with the addition of other planets beside Calypso, there is the...
I think the main reason for withdrawals taking so long is that MindArk doesnt keep the deposited money in a liquid form - so they first have to sell whatever asset they bought with the deposited cash and then transfer it to you.
Well there maybe are no limits for resources such as lyst or oil but there certainly are limits to the amount of available resources such as pyrite (and many others).
Without debating whether deposits influence your returns, from a bankroll perspective I think its better to make one larger depo then making a smaller one each month.
A bigger one time depo lets you play for longer without having to worry about your money running out.
I will try to actually answer your question and leave the negativity out of it :P
I think its easier to break even from mining from the start. There are quite a few resources even a noobie with starter equipment will be finding on a regular basis that has decent markup (over 110%). Its hard to...