How do mobs in maps scale with your char lvl? I remember playing maps and monsters were way weaker and getting 0 exp. I'd like to purchase a map with 20 level req. What will be there for me? I'm level 66
tier 1 starts at max level 15, then +5 per tier.
So at level 5 onwards you can add 25 to the map level to find the highest mob level.
so a level 20 map would have level 45 mobs max, so you'd get practically no drops/exp.
In short just push on, ideally you "need" a level 50/55 weapon with 70+ee and it should be worthwhile investing in one. Damage will be a reasonably significant jump
Also note as a samurai you reach MQ at level 73 rather than 71.