300 soaps is...quite a lot. Practical question - where do you store them all? Do you, like, rotate them one a day and get back to the starting point after the best part of the year?
A suggestion - just never develop an interest in something like cars.
In two cabinets in the study room. They really don't take up that much space, 7-8 baskets in each cabinet, 45-50 soaps and creams in each basket. 7-8 soaps stacked upon each other, 3x2 rows in each basket. Not that much space, really.
I rotate them - but after season. Summer I prefer lighter scents, citrus and menthol, winter I prefer darker scents, spring and fall in betwen scents. Same with my 500+ bottle fragrance collection. I rotate them, but I don't rotate them, so i make sure not to use the same fragrance more than once per year. I use what I like, but rarely use the same fragrance (or soap/cream) more than once or twice yearly though.
I do have a couple of backup fragrances (25-30) so these I will tend to use more often - and also use 6-7 fragrances, that resides permanently in the bathroom, lighter more fresh citrus and soapy scet, that are great to use for these settings and before going to bed (Mugler Cologne, Alvarez Gomes citrus, Gendarme, Lavanda, Cella Classic and the likes).
Same with soaps and cream. I have two backup Castle Forbes Lavender and Lime, a Backup Meissner Gentle menthol, I Coloniali soap and some others and these tend to get more usage, becase of that.
But other than that, I try to rotate them all. I like variety.