What you should be looking at is how many exact searches a keyword has, not a broad match as that could mean anything, including "footballer sent off at half time" which isn't particularly useful at all
[half off] as an exact term gets only 1300 searches per month globally and only 16 searches this month from Germany itself.
It could be sold to a poundstore maybe if they have an equivalent but I wouldn't say it will make you rich overnight lol