I think our real world customers are sometimes not very advanced users, and tend to learn how to use things in a way. If I tell this one customer to do that she is going to think that I sold her a semifinished store. I don't think that my posture here is wrong, and as I said, I didn't mean to be rude. Is just how people use to think. In this case, this is something like: "Hey, I'm trying to add products to this discount, but it seems to be a limit, could you remove it?" I told her to add whole categories, but she answered me that she is not doing the same discount to whole categories. Also, she is adding and removing products every week. She has managed to use the store with limited knowledge, and now I have to explain her a method to add discounts that is different from the one I explained, and is somehow a bit indirect for her.
I'm not trying to rise an argument here, just trying to explain how the situation is. I wasn't aware there was this limit, and it is not a big one, we are talking about fifty products or maybe a few more. I thought it wouldn't be difficult to rise that limit to, say, 200 products. I think this is a legitimate option, and one we should be able to edit, at least within a certain range.
So, apologies if I was a bit rude, but we have to deal with these kind of situations every day, and many customers tend to think that you are trying to lie to them, or even think that you scammed them somehow.
Sorry for this long post, I think sometimes in the Internet is easy to forget we are dealing with real people who suffers the same problems we face, only in different forms.
Thanks anyway, and I hope you give a deeper thought to this question. It should be interesting to be able to handle this limit somehow, at least we as webmasters.
Regards.