At the 'average' conversion rate of 1 = 2, the statues add +0.5 to every sea tile, one half the effect of a lighthouse. But their build cost is nowhere near 1/2 that of a lighthouse...
I can't load the save. I have installed only Rhye's and fall (latest version), Bruhic's patch and the hall of fame mod. And obviously the last patch
I think this isn't a very useful way to look at it (and it understates the value of the Moai Statues). If you don't have a lighthouse, you will only very rarely work any coast or ocean tiles at all. If the lighthouse added +1 food to all your grasslands, for example, that would be huge. The reason the lighthouse isn't huge is that it's improving tiles that you would never work to the point where they are just barely worthwhile. But, once they have crossed that threshold of "worth working", the extra improvement from the Moai Statues is all free.
Here's another way of saying the same thing. Suppose that after building a lighthouse, you could build an "improved lighthouse" which adds another +1 food to every water tile. How much would you be willing to pay for an "improved lighthouse"? Certainly, a lot more than the original lighthouse.
There is no point in building the moai statues before the lighthouse.
Well, of course. Did anyone ever suggest such a thing?
yes, in some way, by comparing the improved output of moai and lighthouse.
Exactly.
There is no point in building the moai statues before the lighthouse.
coast tiles with moai and no lighthouse are barely as good as plains cottages.
Thus, from now on, i'll bring some spy along with my SoDs.
As has been pointed out, building a wonder that requires a lot of hammers to solve the problem of not having many hammers is ... problematic, without a lot of population built up to whip those hammers.