There should be a minimum of TOMA tokens to be paid to the node responsible for processing a `Stack` ?`

[jorgeantonio21]

It results on a net loss for both the user and the node, if the user emits a new Stack and does not use enough compute units. This is so because of gas fee costs (for both user to mint the new Stack and for the node to claim a Stack that does not accrue enough value for pay for on-chain gas fees).

Should Tasks define a number of epochs after which Stacks expire, and in that case, a minimum amount of TOMA tokens are paid to the node to compensate for net negative fees, resulting thus on a net negative balance for the user ?