No not giving excuse for spending money, besides a good GA engine costs nearly the same as does the QG, you ask Mushtaq he quotes all three engines Rs. 55,000 (QG18, QG15 and GA15), so technically there is not the cost issue, yes with QG18 swap in B13, the cost does go up in terms of other little things, but if someone tends to wrap up things tightly, it will cost you 65-70k after adjusting your old engine in it.
One thing I do admit, I really could not keep track of things with my GA15 despite its wiring cleared, and check engine light with normal behavior, that is all due to inexperience for which I always am in search of......