¿Por qué hay tantas secuelas?

Van por la 13

O precuelas o remakes. Obviamente por el dinero pero veamos hasta que punto son rentables. Hay sagas que no han parado de aumentar sus beneficios como Resident Evil, otras que notan el desgaste como Saw, otras con altibajos como Rocky, pero todas son rentables y mucho. Para muestra unas cuantas sagas:

Película	Presupuesto	Recaudación	Beneficios
Toy Story	$30.000.000	$361.958.736	$331.958.736
Toy Story 2	$90.000.000	$485.015.179	$395.015.179
Toy Story 3	$200.000.000	$1.063.136.371	$863.136.371
Resident Evil	$33.000.000	$102.441.078	$69.441.078
Resident Evil Apocalypse	$45.000.000	$129.394.835	$84.394.835
Resident Evil Extincion	$45.000.000	$147.717.833	$102.717.833
Resident Evil Afterlife	$60.000.000	$290.402.566	$230.402.566
Saw	$1.100.000	$103.096.345	$101.996.345
Saw II	$4.000.000	$152.925.093	$148.925.093
Saw III	$10.000.000	$164.874.275	$154.874.275
Saw IV	$10.000.000	$139.352.633	$129.352.633
Saw V	$10.800.000	$113.864.059	$103.064.059
Saw VI	$11.000.000	$68.059.821	$57.059.821
The Transporter	$20.900.000	$43.928.932	$23.028.932
The Transporter 2	$32.000.000	$85.167.639	$53.167.639
The Transporter 3	$41.000.000	$108.979.549	$67.979.549
Rocky	$1.000.000	$225.000.000	$224.000.000
Rocky II	$7.000.000	$200.182.160	$193.182.160
Rocky III	$17.000.000	$125.049.125	$108.049.125
Rokcy IV	$31.000.000	$300.473.716	$269.473.716
Rocky V	$50.000.000	$119.946.358	$69.946.358
Rocky Balboa	$24.000.000	$155.721.132	$131.721.132
Star Wars IV	$11.000.000	$775.395.007	$764.395.007
Star Wars V	$18.000.000	$538.375.067	$520.375.067
Star Wars VI	$32.500.000	$475.106.177	$442.606.177
Star Wars I	$115.000.000	$924.317.558	$809.317.558
Star Wars II	$120.000.000	$649.398.328	$529.398.328
Star Wars III	$113.000.000	$848.754.768	$735.754.768
Blade	$45.000.000	$131.183.530	$86.183.530
Blade II	$54.000.000	$155.010.032	$101.010.032
Blade Trinity	$65.000.000	$128.905.366	$63.905.366
Spiderman	$140.000.000	$821.708.551	$681.708.551
Spiderman II	$200.000.000	$783.766.341	$583.766.341
Spiderman III	$258.000.000	$890.871.626	$632.871.626
Scream	$14.000.000	$173.046.663	$159.046.663
Scream 2	$24.000.000	$172.363.301	$148.363.301
Scream 3	$40.000.000	$161.834.276	$121.834.276
Scary Movie	$19.000.000	$278.019.771	$259.019.771
Scary Movie 2	$45.000.000	$141.220.678	$96.220.678
Scary Movie 3	$48.000.000	$220.673.217	$172.673.217
Scary Movie 4	$45.000.000	$178.710.620	$133.710.620
Shrek	$60.000.000	$484.409.218	$424.409.218
Shrek 2	$150.000.000	$919.838.758	$769.838.758
Shrek Tercero	$160.000.000	$798.958.162	$638.958.162
Shrek the final ch.	$135.000.000	$737.441.725	$602.441.725