Am I the only nutcase here with 90% XMR out of total 60BTC worth of cryptos 
You are not simply because soon after BTC will moon Monero will follow.
If you are expert trader, then yes is wize to also hold Bitcoin. If you are not and you would miss the time when BTC moons and buy Monero at that time with all your BTC, then is totally fine to have mainly XMR.