Yes yes and yes!!
I finally bit the bullet and bought the pastilles bag charm 2 years ago for Christmas and at first I did not even consider paying that much for a charm but after you get over that hump, it's great and it's one of my favourite LV pieces - what's great about mine is that it works with all of my monogram, damier, amarante vernis, and mini lin ebene purses so really I think it was worth the money because I use it all the time and because I hardly ever see any bags with the LV charms it truly makes my LV purses feel very special and unique.
Once I saw the new Epi fleur bag charm, I had to have it even though I did not own an Epi purse so I had to buy the epi speedy in order to use it and both look great together.
I guess if you love a bag charm enough, you will overpass the amount of money and just go for it!
Also take a look at the Bag Charm club and see how awesome the purses look adorned with their bag charms.