Even if you spend the money (there are cheaper ways to do it than 250kpp but involves a lot of farming) it's not always easy to make money with smithing. If you do make it to 250 and you happend to catch some great smithing items early on new expansion, you can make money. For example, when PotC quest came out, the sickles were easily going for 10-15kpp each. It settled down to about 5kpp for a while then to 2kpp. On Xev, they are now going from 400pp to 1kpp range depends on the night. At 1.5k-2k range, you can still make good money on those but below that, it's not worth trying.
As for the other money makers at GM, there are PoP smithing and other high end smithing. As for PoP armors, unless you are elemental flagged, components are way to rare and too expensive. Even if you have enough material to give them a try, the success rate is just too low to make money off them. With some great armor released with ornate patterns and great LDoN adventure point armors, you can't sell the PoP items high enough to make money.
As for things like Tae Ew armor, the components are way too rare and again, not worth making them. Some cultural BD armor does sell well. If you can get a steady supply of BD and some components, you can actually make some decent plats, beyond expected failures.
You are almost better off with making sub-components for tradeskills. You can make a lot more from that than any high end smithing.
Taushar