Yea, start times are usually 1 or 2 hours apart from what I recall. It does suck a bit to wait, but you end up with people at your performance level, so the racing is usually good.
Also, if you're a lucky bastard, you may be able to run 2 series at the same time. Like, maybe Radical RS8s run at 1 and 3 pm, but IndyCars run at 2 and 4 pm. Races are almost always under an hour, so you can run both if you have the endurance.
And, ugh, don't remind me about cars and tracks. The nice thing about buying cars is that they are raced for a whole season, but seemingly always on tracks that you don't own. Meanwhile, the tracks you buy seem to always be raced in a season for a car you don't own. The double ****over is the fact that almost any track you buy now will probably be off 90% of the schedules in a year because of the new tracks that have been introduced.