For resale, everything is negotiable. If you think the overall deal (total price) was good, then it is a good deal.
Dues are paid by calendar year - they really have nothing to do with use year. When you buy from Disney, you pay a prorated share of the first year of dues. For example, if you bought in July, you'd pay 1/2 of the years dues, no matter which use year you chose. (There are slightly different prorate rules for SSR due to the fact that you may not be able to use your membership until the building you purchased is ready for occupancy).
In general, I would not pay any dues for a past calendar year . However, $70 per point plus dues and closing seems to be a good price.
Add the closing costs, the 2003 dues and 1/2 the 2004 dues. Then divide by 160. The result can be compared to Disney's price. (My quick estimate says this will add about $9 per point to the cost, making your overall cost ~ $79/point. I allowed $4/point for maintenance and $500 for closing).
Believe Disney is selling points for the sold out resorts (when they have them) for $84. Are you still happy? If so, you got a good deal - especially if you are buying your first choice of home resort.
Best wishes -