Interesting idea..
For cost, given that 5gp = 1 xp and that '+2 Masterwork' for a skill = 50gp, perhaps:
+1 competance bonus to a skill costs 10 xp {double masterwork cost since its not 'stealable'}
+2 costs 30 xp { 10 + 20}
+3 costs 60 xp {10 + 20 + 30}
etc...
However, teaching is not a sure thing. It depends on both the instructor and the student... so, a new skill: Teaching {WIS, trained only}
The DC of the Teaching check = the students skill level {ranks + bonuses}. For each 5 points over the DC, the student gains a +1 to thier Learning check. You cannot teach a skill unless you have more ranks than they have skill level.
To learn the skill, the student must pass an INT. The DC of this check = intended skill level {ranks + bonuses}. Beating the DC allows the student to learn a thing or two.
It takes a time equal to the students current skill level in months in order to teach them. In this manner Joe, having 5 ranks in Knowledge Arcana and an INT bonus of +2, must spend 7 months in training. At the end of this training he and his teacher roll thier checks. If he beats the DC he must pay the XP in order to gain the skill bonus.
Additionally: The teacher may demand payment, which will vary based on a number of things. Universities, Guild membership, or Noble houses may get 'free' training. Gold pieces or service{apprenticeship} may be common.
Lastly. the Training skill. Not everyone is a Teacher. In the real world it only takes a bit of talent and perseverance to teach. We don't want to make a system that is a virtual free ticket to PC's teaching each other and getting massive skills, but we want the option for a PC to become a Teacher to exist. Hence:
Feat: Sensai (General)
You gain access to the Teaching skill as a class skill. You can train others in skills you have learned. You can earn a living teaching as outlined in the Profession skill.
Note: With this system, it only takes a Feat and Skill point for alot of low level training. Characters can easily train at skill levels. As the characters gain ranks, it becomes harder and harder to learn anything from a Teacher.
You still have costs associated {Time invested, XP cost, and possible GP cost}, but the majority of the Teachers will still be NPC's working at Universities. Everyone else will stick to the common process of earning XP through the trade and level up.
Sidenote: This could allow for some interesting additions to the world setting as Nobles and Guild Members may have a higher skill at a particular thing. This would make a mechancial reason why Guild craftsmen are better...free Competance training... and would expand the abilities of the aristo's.
Not a bad idea.. someone want to snipe at my SWAG of the XP costs?
