Yeah trading them for items is good i guess but for me i dont need money and mainly like the idea of using them for pretty purple items haha.
be good to have the choice thats all.
When selecting two gathering professions, there is going to be some understanding that you won't be making gold from crafting, at least not on that character. Making them BoP is a good way of showing others that, you as a crafter, have made an awesome item for yourself. If you plan on selling the crafted item, it allows you to raise the value and demand even more of a profit.
As others have mentioned though, there is always a chance they'll become BoA or BoE in the future but no promises. :P
there's really not any money to be made with gathering professions, except for trillium veins and golden lotuses, it really should be the other way around ideally. Although I enjoy camping the AH and making gold, going out and farming should realistically allow you to make more money, although I'd say it probably has 10% of the potential crafting professions do