Are you open to the possibility of competing brands bombarding decent products with negative reviews?
FWIW, almost every [negative, because I'm trying to warn others about wasting money] Amazon review I leave is removed for arbitrary reasons set out by Amazon. They seem uninterested in contributions like "this mouse was $30 not 6 months ago, and the current $90 price tag is unconscionable. [LG G602 mouse]" The few times I've complained about shipping problems (as you suggest you've seen) they also removed those.
Amazon is correctly removing your reviews, because neither of your examples are things that belong in product reviews.
Do not leave price related reviews. The prices change daily. You may leave a bad review because you think the price is too high. Tomorrow the mouse may cost $10, but your one star review is still there ten years later.
Shipping problems do not belong in product reviews. The listing is for a PRODUCT, shared by any number of amazon sellers. Amazon provides seller reviews to comment on seller's shipping problems. (If you are leaving these as seller reviews, then I apologize for assuming, and you are correct)
Well, you're not actually reviewing the product. Sure, I wouldn't mind a time series of the price history of an item esp in cases with large jumps. But, generally the point of reviews is to tell me about the product. I can do my own evaluation of what I am willing to pay.
Hijacked product pages and price swings are two of Amazon Shopping's biggest vulnerabilities from my view. Do you know of a price history website/app like you're describing? Sounds like a very good idea.
FWIW, almost every [negative, because I'm trying to warn others about wasting money] Amazon review I leave is removed for arbitrary reasons set out by Amazon. They seem uninterested in contributions like "this mouse was $30 not 6 months ago, and the current $90 price tag is unconscionable. [LG G602 mouse]" The few times I've complained about shipping problems (as you suggest you've seen) they also removed those.