i've leveled straight from 1 to 74 (at the moment), i went to northrend at 68, and currently i have over 1300g on each guy, almost 2000g on my main. i haven't trained feral skills on alts, so i saved some money there. i currently only have regular and epic ground riding training. i don't loot every single mob, but when i do i auto-loot everything and vendor it, i just vendor quest items and drops just to save time. no professions atm either.
luckily, i won't have to actually buy my flying training to fly in northrend, due to my being a druid (x5) and already having flight form :]