my 1st tarp w/ pull outs is still in perfectly fine working condition, even after seeing quite a bit of use.
my second tarp, as i explained before, has seen a little more abuse... in the form of very high winds, & me stretching it tighter than i really should have at times.
also, on the 1st tarp i had tie out lines that came w/ the ray way kit & it seemed to have a slight stretch to it. the second tarp just had guy line cord w/ little or no stretch.
so having a little stretch built in (as headchange suggested) would be a good idea.
but the point i've been trying to make about the inside patch being helpful has to do w/ what bb said in the part of his quote i added above.
remember the pull outs i'm talking about here are being pulled more or less strait out, unlike a guy line tie out.
the principle i'm talking about is commonly applied in construction. the thread going through the silnylon, looping over & coming back through is plenty strong enough, but it's putting a lot of force in one small point on the silnylon.
so if you add something thicker & stiffer between it & the silnylon, it acts like a washer of sorts.
and that addresses the forces that i see taking place in my use of the side pull out tabs on a tarp.