Puggalika-dāna or saṅgha-dāna? If it were the former —an offering that you intended for my personal use— then I would decline it because I don’t use suitcases and there’s no other monk to whom I could easily give it away. If it were the latter, then I would accept it and hand it over to my monastery’s lay stewards. It would then be their responsibility to either barter it for whatever the monastery needs or auction it to pay the bills. Refusing a saṅgha-dāna would be out of the question, unless the gift were something unallowable or the lay donor were under the saṅgha’s interdiction. Luxury French suitcases are not unallowable, however much one might wish them to be. (Although in the case of a Louis Vuitton you’d first need to remove the suitcase’s pretentious monogram, since it’s made out of gold).Can you give us your view of the other point. If I am your disciple and I decide to gift you a Louis Vuitton suitcase, will you accept it.
Now to continue in this hypothetical vein, suppose I did happen to be a suitcase-using bhikkhu who lacked a suitcase? If you came to me and offered to get me one, and invited me to express some preference, then I would certainly go for something inexpensive. Perhaps a nice sensible product like the Trunki Gruffalo. It’s only £39.99 and no reasonable person could deny that it makes a decorous, yet suitably understated, accoutrement for a bhikkhu.
But if you made no such invitation and simply brought me a suitcase that you’d selected yourself, I would accept it no matter what sort it was. Whether it was a poncey over-priced doodah from Paris or a battered old relic that you’d picked up at a jumble sale, or (heaven grant us!) a Trunki Gruffalo, I should accept it with gratitude.
Note that in both of these scenarios my aim would be that of being an easy burden to my lay supporters (subharo) and of light livelihood (sallahukavutti). These are two of the sixteen qualities mentioned by the Buddha in the opening of the Karaṇīyamettā Sutta, upon which the successful practice of mettabhāvanā (and no doubt of bhāvanā in general) depends. In the first scenario I select something cheap so that I don’t burden your bank account. In the second I take what you’ve selected for me so that I don’t waste your time (i.e. by requesting you to go back and change the Louis Vuitton for a Gruffalo or whatever).
As for your other hypothetical scenarios, you can just apply the following rubric:
1. Puggalika-dāna and I need it; I accept it.
1.1. If invited I go for inexpensive.
1.2. If not invited I accept what’s offered.
2. Puggalika-dāna and I don’t need it – I decline it.
3. Saṅgha-dāna – I accept it whether or not I have any personal use for it.