Thanks!

I am the same, GoST and Huntmaster have not been on my list due to high prices and uncertain Fall Standard usage. The ISD duals were much less risky and have turned out to be solid and stable investments for anyone picking them up in the 1 to 1.5 tix range a few months ago.

I see Geist of Saint Traft as not very attractive in terms of a speculative target. It's seen a ton of play in Delver, and so to get large gains on it, I'd be looking for people to play even more copies of GoST than they are currently. This doesn't seem very likely so the outlook on it's price I'd put at stable to lower.

Huntmaster seems weak against Bonfire and as you say Gruul is not in RtR. However, there is some supply issues with DKA cards. It's relative unpopularity is creating a situation where the staples from DKA are high in price. It's really unclear to me where Huntmaster is going to end up as a part of Standard, so I'd avoid it as a target for the moment.

Geist and Huntmaster aren't cards that I have targetted at all. I often thought Geist would dip a little after rotation if the delver deck becomes less powerful­. Huntmaster will go down as well as the constructed play will stop. But I'm fairly confident Geist will find a new home soon and 1 year from now it should still be fairly expensive to acquire.

I focused almost exclusively on ISD duals, buying all I could find below 1.5 tix after the end of the last modern season. It looks like it's paying off quite well! I'd much rather pay 1.5-2 tix for a card, and sell it for 1 tix of profit, with no real risk of a big price drop, than commit 300 tix to 10 copies of a Bonfire that might gain 3-4 tix each, but might also lose 3-4 tix as constructed format ending might drag bonfire's price down

Concerning Geist if Saint Traft, I wanted to buy it one month ago when it was about 22-23 Tix, I should have been more aggressive. And I see it being still a star with RtR, as Azorius guild is in the air, and also because it will be probably easier to cast it in any 3-4 colors decks.
Huntmaster, I don't know, Two 2/2s for 4 might not be powerful enough with RtR? and Grull guild is not in RtR, the price will go down a little bit i would guess?