Im suggest this scheme

LIR membership fixed fee - 100 EUR/year per account
+
Resouce based fee:
- ASN - 0 EUR/year per ASN
- IPv6 - 0.05 EUR/year per IPv6 /48 (i.e. /48 = 0.05 EUR/year, /29 = 50
EUR/year)
- IPv4 - 0.046875 EUR/year per IPv4 /32 (i.e. /24 = 12 EUR/year, /22 =
48 EUR/year)

With parsed public stats from RIPE its resulted as

= 42 529 216 EUR (TOTAL)
--------------------------------
    2 149 200 EUR (LIR fixed fee)
    1 152 761 EUR (IPv6)
   39 227 255 EUR (IPv4)

Someone say, ITS TO HIGH...

But stop!

IPv/4 on market for lease cost over 100 EUR/month (or 1200 EUR/year),
but for LIR its will be cost only 12 EUR/year(!) - x100 difference!

If some LIR dont want to have x100 profit over year - then, this LIR can
return resources to RIPE pool and its will be RE-distributed across LIRs
who seek resources.