IPv4 is a great
investment imo, I sit on about a /19 of IPv4 space that gets leased out monthly. People pay favorable prices comparative to the annual costs for the prefix. For example, right now each prefix (/24) could go anywhere between $100-$130 USD/month.
Numbers wise, you're talking 32x /24 prefix sizes, at let's say $130/month => $4160/month ($49.9K/yr). According to ARIN's fee schedule (
Fee Schedule), that would put you in the "Small" bracket of $2000/year in maintenance costs to ARIN, so, if you leased them all out at $130/month, you'd ROI the annual cost in half a month.
The sad part is you'll be paying $311K for a /19 these days at market rates, which is a 6 year return on investment on those costs at
current rates.