Ok, first of all, you unbelievably lucky SOB! Stop bogarting the wishing wells.
Second, here is a table listing the possible rewards:
Age | Coins | Supplies | Goods
| Medals | FP | Diamonds |
---|
BA | 450 | 450 | 10 BA Goods | 2 | 2 | 50 |
---|
IA | 1080 | 1080 | 10 IA Goods | 3 | 2 | 50 |
---|
EMA | 1800 | 1800 | 10 EMA Goods | 5 | 2 | 50 |
---|
HMA | 2520 | 2500 | 10 HMA Goods | 10 | 2 | 50 |
---|
LMA | 3330 | 3330 | 10 LMA Goods | 19 | 2 | 50 |
---|
CA | 5060 | 4230 | 10 CA Goods | 31 | 2 | 50 |
---|
IndA | 6320 | 6320 | 10 IndA Goods | 49 | 2 | 50 |
---|
from this thread:
http://forum.us.forgeofempires.com/...egarding-buildings-and-their-production/page5
In addition, Bug Huntsman stated that the wishing well gives out the following amounts for the progressive age
7670 coins
6030 supplies
10 PE goods
65 medals
2 forgepoints
50 diamonds
Note that, although some prizes are more likely to occur then others. Goods, coins, and supplies, are all very likely. Medals are somewhat likely, and forge points are a little rare. Diamonds only seem to occur about 1% of the time.
Here is a thread making some value comparisons for the prizes from the wishing well with structures in town that might provide similar rewards and the space they generally take up:
http://forum.us.forgeofempires.com/showthread.php?3087-Wishing-well-value-comparisons
In my opinion it would be worth placing all 9 wishing wells, but they would take up an awful lot of space. That's 81 city spaces. For comparison purposes, that could also get you 5 2x2 houses, 4 3x3 production buildings, and 2 4x3 goods buildings, and you would still have 1 space left over. Obviously that's a pretty big sacrifice. However, with 9 wishing wells going, you probably don't need as many production buildings or residential buildings, you can almost certainly skip all goods buildings of your current age, and as you go through the ages you will probably get enough in terms of goods that you don't have to build any goods buildings, and you might well be able to get away with fewer cultural buildings because you have fewer residential buildings.