As for any activity which is aimed at getting regularily some profit, one of the key aspects for consistency and reliability of the said profit is to closely monitor your performance. Your performance should also be measured in a way that you can breakdown the constitutive elements. It will help you understand where are your best opportunities and know what types of trading you should avoid.

This of course applies as well to skilltrading in hattrick as there are many different ways to skill trade, which, depending on factors like the buying price, efficiency of the prediction, wages will have important impact on your profits. Lets have a look at one profit measurement method:

When skilltrading, you buy a player at the best possible price that you hope will change skill quickly and sell him right after that.

In a spreadsheet, prepare a table containing:
- one line for each player
- two sections with the same columns
1) Sold players (Realized)
2) On going training (Unrealized): of course for those you will miss the final selling prices

This table should contain the following columns of information:
- Player Name and eventually ID
- Purchase price
- Purchase date
- Salary per week
- Number of weeks the player has been in the team
- Salary paid for this player
- Number of training spots used for this player since he is at the club
- Cost of training (number of training spots used * number of trainers/number of spots)
- Cost of listing the player
- Selling price
- Selling price excluding fees

With those information in a spreadsheet, you can compute some interesting figures in additional columns:
- Net profit on the player = Selling price excluding fees - Cost of listing the player - Cost of training - Salary paid for this player - Purchase price
- Net profit per training spot = Net profit on the player / Number of training spots used
- Net profit per week = Net profit on the player / Number of weeks the player has been in the team
- % Return = Net Profit / Purchase Price
- Weekly % Return = Net Profit / Purchase Price / Number of weeks the player has been in the team

Those indicators will allow you to understand:
1) Where does your profit come from and which types of players bring you the most, is it the expensive 17yo, the mid-range 19yo or some higher level 21yo for example
2) How is your current team in terms of previsional rentability
3) And for comparison purpose you should compare the profits on players you skilltrade with profit you do on your longer term training. If you are not making more profit with skill trading, you should stop!

Good luck monitoring your trading profits!