Some players have resorted to buying gold from gold sellers who charge them real money. This is a completely legal method although I would not recommend you to do it because it gets really expensive, and the prices that sellers charge are extremely high. But without gold you will never reach level 70. The best solution as I have found out is to learn gold-making skills myself, and I mastered this skill with Luke Brown's Gold Secrets Guide.
This guide has revealed many gold making strategies that gold sellers themselves are using. These tips are not found in many other guides, and have helped me make the gold to buy the best weapons and gear that I want. Inside Gold Secrets Guide, you will learn exactly which location in the maps you need to go to earn the most gold (exact coordinates are provided). Luke also teaches some effective strategies to use at the Auction House.