Fair enough, it's my personal opinion anyway. However, let's talk about numbers to see if I can get you on the same page.
If your channel is big enough to get special attention from network and you're earning $5,000/month, in a 90/10 rev share your network is getting $500/month. Considering networks normally don't have any costs when it comes to your own business (for example, if you own a website, they're not the ones paying domain/web hosting), they earn $500 (minus taxes) from you every month. What you might get in return is one of their employers time to be available to you at any time of the day/working hours, be part of their promotion series/campaigns on YouTube/social network or they'd help you with re-branding or would offer you a great deal for a new website by their employed designer. All that together, does it really cost $500 at the end of the month, considering they're doing this for bunch of people at the same time? It doesn't. So what's the point of lower rev share? Why should a network earn $1000 or $1500 or even $2000 from your channel? Are they going to invest that much back into it? If they invest even half, they're earning quite some money considering you're just one out of many channels they have. This is also why networks with lower revenue share turn profitable way quicker than 90/10 ones, since the money they invest back into your channel is either none or very little, and obviously a network that earns 20% more would make more money.
This is why I think 90/10 is the real deal. Unless, obviously, there are special stuff on YouTube for huge channels that I'm not aware of, where it's actually worth paying 30% to your network.