BS. In my experience, any one with half a brain moves his lbows back anyway. While sometimes it appears to work, it really doesn't, as you can see if you're the player with the lbows. Musks are 75 food, 25 gold. Lbows are 60 food, 40 wood. This means that musks are very slightly cheaper (wood gathers slower than gold). However, since you need in my experience quite a few more musks than lbows (e.g 60 vs. 40), it is more than enough to counteract the difference. If the lbows have the yeoman upgrade, as they should, then their range makes it worse. Also, if they micro, as any remotely sensible person would (you don't have to be good to micro, I know 1600+ players who can micro effectively), and spread out the lbows, you have no chance.
Theoretically, you'd be better to mass halbs, they have better attack and slightly less hand resist. Sadly they're mire expensive. Since you're facing lbows, hand resistance doesn't do a heap, because the majority of the damage is done at range.
Also, I tend to have a culverin or two and a falconet, surrounded by a meatshield, with a few pikes in front of the lbows to hold you whil the lbows spread out and nail you, so byebye musks if the opponent can think/ has a brain and uses it.