Why? There's not many bones available, and since everyone wants them, supply is drained and prices skyrocket to accommodate. Unless there's no RuneScape gold updates released which make high-prayer a necessity, it will fall steadily. Once you've started seeing new prayers that require a higher amount of prayer (70-99) the level will rise to a higher level.
In the event that there's no updates and the site is in decline, it will slowly decline. It might not be a huge amount each week, but it'll steadily go down a bit each month as time passes. It's simply a volatile skill and is a little like herboloque. Well, with frost dragon bots having themselves into a ball, and blue/green dragons filled with bots I can imagine the cost dropping rapidly.
It is possible to say that prayer is an investment in cash... directly and certainly. But when you are able to get an answer, such as 95 prayers and get turmoil then you get pk and manage it, and you start making more money than you did before. Prayer can earn you money indirectly. The cost will rise and down in a day however, it will always go downwards over time.
Runecrafting is likely to take the longest amount of time, in general, you'll need to ZMI if you have access the lunar spellbook. If not, you can use Abyss. Use penguins to earn points for this. Remember to keep in mind tears of Guthix as this xp can surely be efficient and quick. One alternative is to either make use of the Abyss that is self-explanatory or make earth runes with the FoG gloves as well as Digsite pendants.
Farming is simple and it can be learned in the same manner as other abilities. Simply plant Willow (or Maple) and Curry (or similar fruits) in every patch of trees or plant a calquat, if you wish to. Make sure to pay all farmers and repeat the planting daily at a minimum for fruit , and possibly twice for standard trees since they tend to grow more rapidly. Additionally, you'll want to apply the allotment patch or herb. Remember xp over profit so, for example, cadantine toadflax.
Thieving can be trained through an enticement called pyramid plunder or in the guild. Both methods are fast and the amount of xp required is not a long time to earn. Because you're nearly there for mining, you'll know the best way to go about it. Granite is good xp but difficult to work with, while iron is decent xp and some money in cheap RS gold the process. Additionally, you can use gem rocks , which can give decent xp, with a profit and crafting an xp.
