I guess that one reason bootstrapping is so tough is that it requires a lot of time, usually years, to even start to imagine one day living off of your company.
Imagine you have this nice business idea, which you have been working on for countless hours after work to make it become an awesome product. You sacrife your free time and maybe even health or friendships. You start to feel bad for every day you don't work on your product, as you know it all depends on you, and maybe a couple of co-founders. You know your product is great and it could make many customers happy. Yet what you earn from your it is peanuts and you don't see how this will change any time soon.
In that scenario, venture capital or a buy-out seem like a very appealing idea. After all, if you've come this far, it means that your product means a lot to you and you have more ideas than time. And suddenly knowing that you could get a decent amount of money to quit your "boring" daily job and make all these ideas come true gets even more interesting.
That burning desire to make your "baby" succeed should not be underestimated. That's why so many startups try hard to get a decent funding. I can't blame them, because I've been there. Heck, if a "big player" came to my little startup and offered a good deal, I would probably more than consider taking it. In the end, life is short and you can only build so many valuable things in your life that might have an impact and make a difference.
Still, I'm happy to have a fully bootstrapped startup that is not yet bringing enough money to quit my job. It is tough, it takes a lot of patience, and even more sacrifice every day. But also the prospect of making it profitable enough to have a small team that can work on your idea has a special kind of appeal. Not wanting to be the next Google or Facebook is a good thing in my opinion, but I understand that there is a lot of people who just burn with desire to push their ideas forward faster. Can't blame them for that.