I don't think anyone in this thread said that the price for the tea party decor is cheap - they are rejoicing simply because it is released again. And of course it's ok to spend gems on stove - it's each player's choice - we are just saying that the price tag for an oven should have been in coins instead of gems. Unless you prefer to pay everything in this game with actual money, that is.
I am a little confused as I read the thread actually - the main debate (I think) is not about whether 5 gems is a reasonable price, but rather that the recipes/ oven could have been made available to more players for whatever reason each player plays the game - for the fun of baking, for cute food items, as part of the bakery's design, or for gems. Again - unless you feel privileged to have something that most players will not buy with actual money. But even for that purpose I suppose there are already plenty of choices in this game: wallpapers, tiles, floor decorations, boxes etc.