Well, not quite.
Most of my peers/friends who fly Gulfstreams/Globals/7X etc make between 150-225K. No...not rich by any stretch...but getting by just fine. Some newer guys may get abused at 125K'ish but they usually move on pretty quick...like any profession, there's an experience building phase.
Most also work between 8-14 days a month. Want some extra money? plenty of time for another job. Many I know contract fly or work at sim centers for an extra 10-50K. Since leaving CFI/Charter work I have never had a flying job where I regularly worked more than 15 days a month and for the last 3-4 years I average less than 70 nights away. The vast majority of larger corp aircraft I know are crewed well. I'm home with my family more than just about any father I know (aviation or not)
And Yes, anyone who wants to can certainly fly a 777 or a Gxxx (or whatever) Its not rocket science. Average commitment, defined career goals, dedication etc...fly what you want!
I wouldn't suspect pay/lifestyle is terrific in an EMB-145, but it may suit you just fine? To each his own...but I can tell you that your view of the typical Gulfstream/Global/7X gig is far from accurate!