You may make bribery attempts without spending money or making Wealth checks, provided you are dealing with individuals or organizations that are helpful, friendly, indifferent, or unfriendly toward you or those you represents. Dealing with individuals or organizations that are hostile requires you to make Wealth checks as usual when using the bribery action.
Additionally, skilled diplomats are well paid for their loyalty and dedication, and they are accustomed to traveling in style. At 5th tier, and again at 8th tier, you gain a one-time Wealth score increase of +4.