I hate the term "selling out". Honestly, it jsut pisses me off. All it can really be summed up as is "they suck because they wanted money." Fun fact: EVERYONE wants money. That is why people work. That is why people are happy when they get a pay raise. If someone offered me $100 for a drawing I did, I'd accepy, because hey, free money. Basically, you kind of need money to live.
It is not bad to make money from doing something you love. Even if it's a LOT of money.. it's like taking a job that pays a six-figure salary. If it's you, and you honestly love your job, then that's awesome. Good for you, man.
I define selling out as completely compromising your morals and beliefs for the soul purpose of making money. That is freaking EXTREME. I am talking about shit like advertising for huge corporations or something. To me, only about 5% of bands that people accuse of selling out have actually sold out. Green Day, for example, who aren't even trying because they know that whatever bland anti-american shit they spew out will be eagerly purchased by millions of 14 year old fans. Otherwise, if it's good music, I'll listen to it, regardless of whether or not the artist actually makes money or if it's been on the radio or what.