We are at the thin edge of the wedge where spending on cars comes to play, s30s are steadily becoming rather pricey and I do think that trend will continue. Consider how much an a1 show mk1 rs2000 or a fully Rallye prepped mk2 costs these days, spending that sort of money becomes more acceptable, as the owner is more affluent or cash happy in the first instance. Even these £25-40k cars are still the thin end, think about how much these classic Ferraris go for.
A good friend if mine, one of my best works for a company that restores and sells classic 911s. Some of the cars they work on the pannel costs alone are a mortgage job, some of those cars are worth almost twice what my house is! I used to pop in now and again, they have moved further into the countryside now to larger premises, the quality of those cars was/is exceptional they been in a lot if the magazines for their work.