One of the main problems is of course at places like RHR where after round one this year I was sorting through my box of tyres to find a set WORN enough so I didn't grip role everywhere. This of course couldn't happen if i'd already had the new sets scrutineered so i'd end up cutting off ridiculous amounts of spikes from a new set that would probably not last the meeting and certainly wouldn't be any good for any regionals afterwards.
Get a grip guys (pun), no one uses silly amounts of tyres anymore and the savings that we've made elsewhere in the hobby more than cover the tyre costs anyway.