I won't have a go at anyone, I'm intrigued as to why the experiences of present racers is of no use to you.
You can't deny the costs involved and it is best to know them up front. tell people it will cost £6k and if they do it for £4k they will be well happy with the savings and come back for more. Tell them it costs £4k and they over spend by £2k you won't see them again.
I would love a cheap race series but skimping on tyres/warmers and other luxuries is false economy. One off cos you pushed too hard on old/cold tyres and you really will be counting the cost. How many of you t/dayers do 1 lap and then ride at 110% ? That's what you're gonna be doing even on the coldest days.
On that note also remember to take out accident insurance that covers racing, not many do but CICA do and pay out quickly
