I think i will respectfully pass on your offer :-)

The demand for premium .io domains and the aftermarket sales continue to increase day-on-day. Below are just a few reported sales of random .io domain sales (many go unreported e.g. Bets.io, slots.io, casino.io and many more)

Domain     Price
swipe.io    68,000 USD
lucky.io     67,000 USD
tank.io      60,000 USD
Jackpot.io  48,500 USD (most recent sale via DAN - 2020-07-05)
cloud.io     45,000 USD
esports.io  40,000 USD
cook.io      39,750 USD
matrix.io   30,000 USD
library.io   30,000 USD
home.io    25,000 USD
voice.io     25,000 USD


My thought process for starting the bidding for betting.io at 5 BTC (current value $58,195.50) was because i felt other sales like lucky.io at $67,000 and esports.io at $40,000 where good comparable sales which i could benchmark this premium gambling term 'betting' against (544,000,000 google results) - I hope the above gives you a little more insight.

Best Regards,
BG