The commercial growers have the advantage of choosing to photograph from a whole row of the plants that they will offer. Sooo, of course they will pick the absolute Best flower or two of that day, and the next, and..., and then pick the very best of the batch to put into the database. I do not think there is a lot of deception going on.
To add to what Betty said earlier: time of day can make a BIG difference as to how the picture looks. This is especially true of flower color and texture. Some flowers can completely change their look from dawn to dusk. That's why I have started to enter time of day into the pics that I post here (if I can remember correctly--gets harder all the time).
Light plays an important role in how the flower looks. Bright sunlight can wash out the color in some, enhance it in others. Bright, but not direct sunlight can give a more accurate picture of a flower's texture. It can show flower surface qualities that get hidden in too bright light.
I like this site because it shows the flower in a range of conditions. I tend to purchase the ones that there are a lot of pics, and they show more uniformity across a range of growing conditions. It's no guarantee that at your home they will look like that, but it tilts the odds in one's favor.
