Believe me my friend, I completely understand you. If you are using some of those ultra-high resolutions, skin is really small, especially those letters. But, that's the problem with this skinning engine... it's not possible to make resizeable skin with these tools we use, at least I'm not aware of any possibility.
Anyway, I'm sure there are some other nice skins in download section, little bit bigger than this particular one... and I believe you'll find something that you like and that fits nice your screen resolution. Believe me, it's a lot of work, and I personally think it would be much more productive to spend it on creating brand new skin.
Cheers !