because nobody wants that apart from newbie accounts like you who are bag holding it.

in fact everyone knows that Ethereum is the most useless token that was ever created! people only use it to either make profit when it pumps or create ICOs and scam others.
etherum had for quite a while a much lower transaction costs than bitcoin, and bitcoin is actually without ethereumn that continued accessibility of cryptocurrencies, just a propaganda coin that is spread to annoy everyone.
whenever there is a congestion the whole ethereum network is crippled and medium cost of a transaction goes up just like bitcoin. it has reached up to $4 in the past.
besides if transaction fee is all you care about then go use literary any other altcoin, they are all with much lower fee because nobody ever uses them. or better yet go use one of those 100% free coins like NANO with always 0 fees.
with the growing interest of Ethereum enthusiasts, it would be great to make it the main coin and overcome like Bitcoin. with this development making Ethereum supporters increase their support for Ethereum to be able to come to Bitcoin.