As you move up it is important to have the low pp and 1/2 small sc's in your perceived range in early position for balance reasons but for most people they are slight losers and marginal winners at best.

As for myself if I play them at 50nl & above I always raise them but am happy to fold them sometimes depending on game conditions.

However as I mentioned in like the 10cent games when there are a large % of people seeing the flop in limped pots small pp & sc's become really profitable.

Why? Because you hit a set about 1 time in 8 and if 5 people are routinely seeing the flop you only need to get a miniscule amount in post flop when you hit a set to make them profitable.

But if you raise 4bb thin the field to 1 maybe 2 callers & have little cbet fold equity then you have to be able to build a 30bb+ pot everytime you hit a set oop just to make them break even. (Quite hard to maintain as demonstrated by the fact the most regulars are slightly -ev with these hands from ep.)

(& because so many weak players limp or min-raise their strong hands in ep at this level you can actually get away with limp re-raising these hands sometimes as your perceived range is really strong even though your actual range has no strong hands in
this completely un-balanced spot)

You'll see alot of the cardrunners guys on videos like 1 yr ago would never open limp at their mid-high stakes level but routinely limp these hands (hands that shoot up in ev when 4+ people see the flop) when they made low stakes videos for exactly these reasons.
Nowadays though they're hammering home a solid basic strategy that micro-limit players can build on as they move up.
(Rather than encourage open limping because they're unlikely to understand the reasoning behind it or apply it correctly in game time situations, even though its profitable in some loose passive games)