My opinion on the matter of where to play the lanes...
1) If your main goal is to be a good league bowler, and you don't bowl too many different places, and the conditions are similar every week, you can probably get away with mastering one area of the lane. You can focus on buying equipment with weaker covers and cores, and using weaker layouts to keep you outside as much as possible.
2) If you want to enter the realm of tournament bowling, you'll need to be more versatile if you want to succeed. Some patterns just can't be played that successfully (or at all) from an outside line. As for the guys you mentioned who you've never seen playing inside...I'm sure they can and do when they need to in order to make money and place well, and when they are in situations that allow them to play to their strength, they show up on TV
, and that's when you see them.
3) I hear a lot of people get hung up on learning to play different area of the lane, or using different hand positions, as though its a completely different thing. Try changing you mentality. Playing fourth arrow, and playing first arrow aren't completely different things; if the lanes are telling you to be there, you simply line up with your target, projects the ball toward your breakpoint, and let the pattern steer the ball. Sure the angle is different, but the physical motions aren't.
4) Consider your style. (I believe I've read you're a two hander) The two handed style is the ultimate in today's power game. It produces more speed, maximum revs, and as such is prone to the inside line. If you want to play outside, this style of delivery may always fight you. I'm not knocking the style, just saying it might not be best suited for what you style is.