It wasn't really a bug and the cars still drive on the same laser point cloud data. What was changed was the precision of the calculation for the physic engine. They´d thought a simpler calculation would do it (better for slower CPUs) until they saw some telemetry output.
That´s the essence of some dev posts, as I understand it.
When you are just after the participation credits, yes, then you should be out of the rookie license at the beginning of a new season. (Next season starts end of January) And no, there are no series with the rookie cars other than the rookie series. For a D-class series you have to buy the car and some tracks. It´s realistic to say you´ll spend another 70$ for the D-class participation. That´s for 6 items, because you´ll get the 20% bulk discount then. Sure, you don´t need all of the tracks, but then you can´t participate in a week when the series runs on a track which you don´t have. Not good for the participation credit.
You could store cars and tracks on a DVD or external HDD and copy the car and track you like to run to your internal HDD everytime. The sim, one track and one car requires about 400 MB space. But, is your laptop capable to run iRacing? (CPU, GPU, RAM)
Cars are always $11.95, most tracks are $14.95, some are cheaper. It is a one time purchase. You´ll keep them when your subscription runs out. When you come back later, everything, including your licenses and ratings are still there.
You get a refund of 4$ for D/C-class series, 7$ for B/A-class series for participating in 8 of 12 race weeks of a season, max. 10$. Participation means one race and completing at least half of the laps of the winner. There is no refund for rookie races or fun series.
You´ll be put into a server with people who are at the same iRating level. An experienced simracer will be in the best race splits very soon. There are several trial offers. At the moment, there are 3 months for 12$ or the Grand Prix promo which includes 3 months, the Williams, Zandvoort and Silverstone for 35$. In the latter, the price for the car and tracks is higher than the complete 3 month deal. It also allows you to participate (even as a rookie) in a Williams fun serie, which runs on these tracks + 2 tracks of the base content. Any of theses new customer promos can only be used once per account.
You don´t have to buy all the tracks. When you buy a car and two tracks for example, you get a 10% discount, or buying 6 items at once a 20% discount. When the series is at a track you don´t own, you still can compete in one of the rookie series.
When I look at how many members are logged in at European prime time, there are currently more than 2000, while there had been hardly 1000 a year ago. And there are about 50 new members joining every day, also about twice as much than a year ago.
The developpement of the core sim is completely independant from adding new cars or tracks. A 3D-artist or track builder is not capable of programming or doing research for a new tire model. So this arguement about fixing the core sim instead of adding new content is not leading to more participation. Kaemmer is a perfectionist. He is always working on improving the core sim.
A new car or track from time to time is really welcomed by iRacing veterans like me. Always the same cars and tracks gets boring.