Sounds like you've got it sussed.
Going back to the original topic, I can confirm I have had mixed success with e bay eggs, largely due to the postage i think. As Harry noted ,it is better to collect eggs locally.
It is very tempting to buy eggs on ebay, especially the more interesting breeds. I have now concluded myself, to not have eggs posted, but to put up with what I can find locally. i also think, in the long run it can be better finding pols locally, if they are a good price.
while i think ex bats are an admirable cause, it is nice to have fancy breeds as well. For egg colour, meat and variety.
The problem can be that in trying to cover all options, you end up, like me, with 40 odd birds and a couple of hundred eggs each week which need distribution. I have a few meat birds but am still coming to terms with actually eating birds that I have nutured.
Once you get started on hatching/breeding it gets very addictive. i still get very excited when a chick hatches or a pullet comes into lay.