Bulld 766,is right a lot of depends, the family had a funeral over the new year, that cost was about 50 000 baht, and with what I know, that was about as cheap as you could do it,3 nights with 100 baht in the envelop, each night about 1500 baht, food was cooked by the family, that being a big part one meal on the last night cost 5000 baht, not that much alcohol was drunk, now been to a funerals where you just got a carton of milk and small cake, not a bad Ider, keeps cost down, no one seem to complain they was no "Jog", rice porridge.
The funeral pyre was done with charcoal,3 sacks, which is about the norm; one sack is now about 300 baht.
As bulld said, there was a village "insurance ", that is funded by members paying 100 baht into a fund for every person of the fund who dies, in this case that amounted to 20 000 baht, not a lot, but it helps, on the day and over the 3 nights, they got about 7000 baht from the mourners, a couple of 500 baht donations most being 100 baht.
But a lot also has to do with face, it has to be right, with local headmen and government officials present, the mother-in-law died, just before a big election a prospective candidate came and gave 1000 baht to the family, the Abbot of the Wat gave them 1000 baht.
Wife's son-in-law's mother died, they are all just rice farmers, big village do, I was told afterwards that cost 100 000 baht, where the costs went, I do not know, again as builld said, how long is a piece of string.