It makes sense why they'd be unsupportive... my parents gave me the same attitude when they heard I bought Sky two saddles (one dressage cause his old one did not fit anymore cause he gained a LOT of topline) and the western. They told me "you bought two?!?! Why?! You can only use one at a time??"
Well... they are used for different purposes.. it's kind of like having two pairs of shoes. Ones you use for hiking.. others you use for nights on the town.
So hopefully that alleviates your frustration towards them.
Now about your saddle.. do you know if it's going to fit properly? What if you get it and it doesn't fit? Maybe it's better to save up $$ and get a saddle that you can trial out and then buy when you feel that it's the right one.
Just a thought... we tried 4 different English saddles on Sky. Only one of them fit him right. The others seemed like they'd fit however upon riding in them and examining closely.. they would not suffice. If I went for the cheaper option that sort of fit.. he would have eventually hurt himself over time.
So maybe instead of jumping into it.. wait it out and get what you really want.
"Strength is the ability to use a muscle without tension"