I've been looking at other people's views on scams regarding hatching eggs and would like to express my own views.
While it is true that there are a number of scams on eBay, and I have been one of the victims of this myself, I would like to point out that, if you follow the eBay rules, you can report the offender and eBay will look into your complaint.
It is easy to say 'Look at the photographs and beware if they seem too good to be true'. Certainly, in the case of Californian quail, a lot of people do use photographs without permission. This may be because they haven't got digital cameras, or the quality of their own photographs does not adequately represent their birds, but the use of other people's photographs does not necessarily mean that they are cheating over the eggs.
It's a good rule of thumb to make sure you are familiar with the appearance of the eggs you are buying. It's easy to search the internet and find pictures of Japanese quail eggs, Californian eggs, etc. Japanese eggs are generally larger, rounded at both ends and have a beige background with large brown blotches. Californian eggs, on the other hand, have a very pointed end (more like a spinning top), and are generally much paler in colour, with light brown freckles.
It is also a sensible precaution to look at the feedback of the seller to see what other people's experiences have been, to check how long the seller has been a member of eBay, whether they specialise in any particular kind of product etc. Too much negative feedback is never a good sign. If a seller attracts too many complaints, eBay will investigate and may remove them altogether.
It is always advisable to complete transactions through eBay, using PayPal so that, if any problems do arise, they can be dealt with accordingly, provide the complaint is made within the specified time limit (currently 90 days). This means that, even if a seller has sent the 'wrong' eggs, these will hatch within 3-4 weeks, and it very quickly becomes apparent which kind of birds these are. Even at the age of 1-2 days, the Californian quail babies will have a little tuft on top of their heads which is absent in Japanese quail.
On a personal note, I've been breeding Californian quail for a number of years now (and have over 150 breeding pairs) and make sure I regularly bring in new blood to keep my stock healthy and strong, and ensure high quality and fertility. I have a good client base and feel that generalised criticisms can do more harm than good.