With respect if you actually believe that driving a bus is similar to driving a train you might as well compare neurosurgery with being a miner.
Their only link is with the word "driver". The job is completely different; more passengers, responsible for more equipment, technical knowledge required, rules and regs, distances, communications, track knowledge and more safety rules, regs and procedures than you can shake a stick at and not one aspect of it transferable from the Highway Code and car driving test!
The money certainly is the biggest factor once you get into discussions in the rest rooms. Some folk totally hate the job but stick it for the money that it brings and end up a slave to the shift pattern. Some even claim they could never cope with a job that pays less as they're mortgaged to the hilt or just in the habit of spending.
Be aware of what you're getting into, money really isn't the best part of the job and if you can't stand the hours, the tedium, the grime, the dirty crew rooms, the tedium, the same routes, the holdups, delays, tedium, engineer abuse, passenger abuse or the tedium then you're gonna be depressed a long time!