A common easement is from NB Power.  It is written into the deed that NB Power can have power lines or an anchor on your property.  It is transferrable to all future owners.

The seller of the listed property pays the commission to the realtor.  Buyers do not have to pay commission. 

This cost will vary from municipality to municipality. In Sussex, it is about $1/day but it can be much higher in different cities.

A dusk to dawn light is a large bright light (usually mounted on an NB power pole) that automatically comes on at night and turns off in the morning. It provides light at night if you don't have street lights. The light can be rented from NB power for about $13/month or purchased. You pay for the power it consumes as well.

Realtors only get paid if a listed property sells.  There is no fee if the listing expires and is taken off the market.