Why I Accept Trades that are Bad for Me (on paper)

Here are the trades I offer that do me good: 

• I buy 5 star cards for a flat rate of 40 stars per card,  unless prestige, and then 50 stars per card.
• I sell Sweet Duet for 15 stars. It is the rarest four star in the current album. 
• I sell any other four star cards for 12 Stars.

Here are the trades I do more or less as a service to others:

• About midway into the season, I trade any four star I have (other than Sweet Duets, in the current album) for any other four star card.  1:1. I lose one trade for the day and gain nothing. It is not good for me.
• About midway into the season, I trade any five star I have (other than Monopoly Tunes or Prestige, in the current album) for any of other five star. 1:1. I lose one trade for the day and gain nothing. It is not good for me.
• About midway into the season, I sometimes trade a five star card for the 40 stars I paid for it (at current market rates). I do this to assist others. For me, I lose the five star I wanted and I also lose one trade. It is not good for me.

What I Gain From Losing Trades:

Here is what I gain with 100% of these trades: trading relationships, and those relationships translate to me finding what I need when I need it. Having multiple accounts is way more powerful when you have a network of contacts that want win/win trades instead of trying to trade against you. 

Trading partnerships is my first concern when I contact someone and the trade itself is secondary. 

Note: One more advantage it could have had for me was this, which has yet to actually happen: