The answer is:
Basic entry fee: £1
With hall: add £3 for each hall hired
With sleeping facilities: add £2
Add £1 per 100km
Add £2 for each (free) catered control
Hope that helps. FY.
An interesting concept, and I'm not knocking it - this gives potential "new organisers" some form of a target to aim for.
I think the problem lies with the niche events.
Using FR's formula, I would look at charging £29 for the Bryan Chapman rides.
This would probably reduce the field to a couple of dozen. So I would have about
£700 to play with. Not enough to hire the halls and YHA - all of which I have to pay "up-front".
On the other side of the coin, the tariff for a 200k event - arguably the most popular "long distance" event with 3 non commercial controls would attract an entry fee of (typically) £12.
And a typical BP event would attract an entry fee of £11.
Personally I think more than £5 for a 200km BR or £3.50 for a BP is a bit OTT.
Some of the best 200s I've ridden have only cost £3.50. It's down to the skill of the organiser.
I think the moral (if there is one) is "do it for the cyclists", or a la
Field of Dreams "Build it, and they will come".
Now I will retreat to a safe patch on the farmstead - little wonder I'm a blacksheep.