Guild Wars 2

anyone know if stacking ghost infusion makes any diff?

It makes the effect more pronounced. There’s diminishing returns with the effect though.

https://www.reddit.com/r/Guildwars2/comments/567e34/18_ghostly_infusion_comparison/

The additional effects are minor, IMO. If you can afford it, go for it. Otherwise, I’d sell and stack different aura types until your toon is a glowing ball of awesome.

The difference is somewhat in the eye of the beholder; you’ll have to decided for yourself. (Ayrilana’s link is quite helpful for that.)

My impression is that there’s an RNG component to the effects: which little blob jumps or grows, and by how much or how far. By stacking infusions, you get more ‘crits’ of the more notable effects, which gives the impression of a deeper or richer effect. (And it sort of is, depending on your point of view.)

tl;dr check it out for yourself; if you can ask the question, you can probably afford the minor costs of not liking it enough to keep.
If you have magnetite, I’d say spend it on the infusions; you can always remove and sell them later if you don’t like the effect. If can afford the the TP costs, I’d recommend putting in custom buy offers for a few — if you don’t like the combined effect, you can still remove and then sell for customer offers; you’ll lose some gold (mostly due to fees), but nothing you won’t be able to spare to check it out.