Secondly this is more like running it for free because most of this transaction have very low fees. With the way miners are currently feasting on transaction fees will someone dedicate their money and time to mine others transaction for some little penny, I think the incentives from the transaction fee that other miners will earn will be too tempting to leave, that’s why free accelerators like Viabtc actually have limited space. It is definitely not a viable idea seriously.
However my suggestion is miners can occasionally bump the thread when they feel like.
They can pick anytime convenient for them . besides they don't have to announce their deeds if they don't feel like.